Valve mechanism



Nov. 9, 1943. v. o. BEAM VALVE MECHANISM Filed'Jfily 11, 1942 I I I I I I l l I I I I l l l l I I l I l ll INVENTOR. VI L Y/Y N 0. 5159/? BY %2ye A? W ATTORNEY.

, forming the walls of e s m g 1 jj 2,333,913

OFFICE] j vAL'vE echan sm" Vilynn O; Bea. n, -lllinnea po v Minneapolis-Honeywell Minneapolis, Minn s Minna assignor to Regulator Company. v

a corporation of Delaware Application July 1 1. 1942, Serial No. 450,614 '10 Claims. (!.137-153) The present invention is concerned with a valve mechanism and more particularly with one functioning both as a shut-oil valve. H An object of the present invention is to pro-' pressureregulating and as a vide a combined pressure regulating and shut-ofl A further object .of thex present'invention' is Gil - designated by the reference panying specification, claims and drawing, of which the single flgure is a schematic showing of a gas burner controlsystem employing my improved pressure regulating and shut-oi! valve. the valve being shown in section.

7 Referring to the lower portion of the drawing.

' my improved valve mechanism includes a hous- The lower section is ing having three sections.

numeral i0,'the intermediate section by the reference numeral II, and the top or cover sectionlby the reference numeral i2. The lower section in constitutes a valve casing having the usual inlet connection It and outto provide a pressure regulating and shut-oil} valve of the type discussed-in which the various valve elements are positioned by diaphragms pressure chambers.

A further object of the present invention is to provide such a combined pressure regulating and shut-oil valve in which the pressure regulating valve and the pressure chamber for actuating the pressure regulating valve are located on opposite sides of the pressure chamber for positioning the. shut-off valve. A

A further object of the present invention is to provide an arrangement such as set forth in the last object in which the chamberbetween the pressure regulating and shut-oi! valves is connected to the chamber controlling the position of the pressure regulating valve by a passage extending through the valve stem. v

A further object of the present invention is to provide a pressure regulating valve in which the pressure in the pressure chamber is unaffected by turbulent or Venturi effects in the fluid flowing through the valve.

A further object of the invention is to provide a combined pressure regulating and shut-oi! valve for a fluid fuel burner in which provision is made for supplying fluid fuel to a pilot burner at a substantially constant pressure.

A further object of the invention is to provide a a relatively compact diaphragm valve with biasing means capable of exerting. a relatively uniform bias on the diaphragm throughout its range of movement.

let connection it. Extending between the inlet and outlet connections I! and I5 is a partition wall It having an opening I! therethrough. A valve seat member is secured to the partition wall l6. This valve seat member comprises a cylindrical section 2i of relatively small diameter and a cylindrical section 22 of larger diameter.

These two sections are joined by a flange 23 which rests upon and issecured to the partition wall It. The lower end ofthe cylindrical portion 2| terminates in a valveseat 25 andthe upper'end of Other objects of this present invention will apparent from a consideration of the accomthe cylindrical portion 22 in a valve seat 28. A passage 21' extends through wall l6 and communicates with a passage 28 extending through the valve seat member 20 between valve seats 25 and 26. I

A pressure regulator valve disk 28 is adapted to cooperate with the valve seat 25. The throtling valve disk 29 is secured to a stem 30; Also secured to this stem 30 above the valve disk 29 is abaflle disk 3i, the function of which will be explained later.

Extending downwardly from valve disk 29 is a guide stem 32. This guide stem is adapted to slide up and down within a cylindrical recess 33 of a stud 34, the lower end of which is screwthreadedly secured to the valve casing Ill.

The stem 30 is reduced at its upper portion to form a shoulder 36. The central portion of a diaphragm 31 is provided with an opening having the same diameter as the diameter of the reduced upper portion of stem 30. This reduced upper portion extends through the diaphragm and a collar 38 is secured over this reduced portion. The central portion of the diaphragm 31 is thus clamped between the shoulder 36 and the collar 38. The outer edge of the diaphragm is secured between housing sections ifl-and Ii. A pair of'valve rings 40 and ll are secured to the opposite sides of the diaphragm 3l'so as to form with the diaphragm a main valve disk adapted to cooperate with the valve seat 26.

A second diaphragm 44 is clamped at its outer edge between an inwardly extending annular wall member 48 projecting inwardly from the intermediate housing section II and a clamping ring 41. The central portion of diaphragm 44 is provided with an openin also of the same diameter as the reduced upper portion of stem 38. This reduced upper portion extends through this opening and a further collar 48 is secured on the reduced upper portion engaging the top of diaphragm 44. The central portion of diaphragm 44 is thus secured between collars 38 and 48.

A third diaphragm 58 is clamped at its outer edge between housing sections II and I2. The central portion of this diaphragm 58 is apertured and extends over the upper end of stem 88. The extreme upper end of the stem 38 is threaded and a nut 52 is threadedly engaged therewith. A backing disk 53 is disposed between the nut and diaphragm 58. The nut 52 serves to clamp the central portions of diaphragms 31, 44 and 58 in position between the shoulder 36, and collars 38 and 48, respectively.

Diaphragm 31, as was previously noted, forms with the valve rings 48 and 4! the main valve disk. This diaphragm likewise serves to determine the position'of this disk. It will be noted that the diaphragm 31 forms a lower wall of a pressure chamber 88 bounded on the upper side by the annular wall 46 and diaphragm 44. Diaphragm 44, because of its relatively small diameter, plays little part in the positioning of the valve members. Its function, primarily, is to act as a sealof! diaphragm to permit a limited movement of the valve 38 while preventing the passage of gas therethrough.

The upper diaphragm 58 forms the upper wallof a second pressure chamber 42, the lower wall of which is the annular wall member 46 and the diaphragm 44. The pressure chamber 42 functions to determine the position of the pressure regulating valve disk 28.

A passage 55 extends through the reduced upper end of stem 88. This passage terminates at its lower end in an opening 58 below diaphragm 81. In other words, this opening 56 is between the pressure regulating valve disk 28 and the shut-off valve. At its upper end, the passage 55 connects with a passage 51 extending transversely through the collar 48. The passage 55 thus connects at its upper end with the pressure chamber 42 and serves to connect the pressure chamber 42 with the space between the shut-oft and pressure regulating valve and to maintain within the I pressure chamber this pressure between the two valves.

A leaf spring 68 is secured at its right-hand end to the under side of the top housing section l2. A lever arm 61 is pivotally secured at 62 to a bracket 88. The right-hand end of lever arm Si is provided with a curved portion 65 adapted to bear against the upper end of stem 88, The leaf spring 68 is slotted adjacent its left-hand end to permit the right-hand end of lever 8| to move therethrough. The left-hand end of lever 81 which is pivotally secured to the bracket 63 has a pair of upstanding legs 81 which straddle the bracket 68. Extending between these two legs is a pin 68. The left-hand end of leaf spring 68 extends between these two legs and engages the pin 88 to bias lever 8| in a clockwise direction and hence bias valve stem 88 downwardly.

The valve assembly which has just been described is employed to control the flow of gas to a main burner 18. This burner is connected to the outlet I5 of the valve assembly by a pipe 1|. only a portion of which has been shown in order to simplify the drawing. The inlet 44 of the valve assembly is connected to a gas supply pipe 12 leading to any suitable source of supply (not shown). Associated with the main burner 18 is a pilot burner 13 which is connected to passage 21 by a pipe 14 and is hence supplied with gas through the pressure regulating valve 28 and passages 28 and 21. As is customary, the pilot burner 13 is employed to ignite the main burner 18 and is normally constantly burning.

The gas pressure within the chamber bounded by diaphragm 81 is controlled by means of a pilot valve generally indicated by the reference numeral 16. This pilot valve and its operating mechanism is illustrated in greater detail in the copending application of Daniel G. Taylor, Serial No. 390,553, filed April 26, 1941. Reference is made to that application for a detailed understanding of the pilot valve. As shown in the drawing of this application, this pilot valve comprises a housing 16 having a pair of valve chambers 11 and 18. The valve housing 16 is provided with three openings 18, 88 and 8|. Opening 18 opens into the chamber 11 and connects at its outer end with a pipe 82 extending to the gas supply pipe 12. The chamber 11 thus constitutes the inlet chamber of the valve mechanism.

The passage 88 connects with a pipe 88 connected to the first chamber bounded on its lower side by diaphragm 31. The inner end of opening 88 is connected to a chamber 84 which is adapted to be placed in communication with either chamber 11 or chamber 18.

Opening 8| which connects with chamber 18 is connected with a pipe 85 which leads to a bleed burner 86 for burning the waste gas. Thus, the chamber I8 constitutes the outlet chamber of the valve mechanism.

Each of the chambers 11 and 18 has an intumed portion at its outer end to form a valve seat. A ball valve 88 is located within chamber 11 and a ball valve 88 in chamber 18. Springs 88 and 8| are located within chambers I1 and 18,

respectively, and serve to bias the ball valves outwardly against their seats. When ball valve 88 is moved to open position, communication is established between opening 18 and opening 88 leading to the first pressure chamber. When, on the other hand, valve 88 is against the seat and valve 88 is away from the seat, communication is established between opening 88 and opening 8i leading to the bleed bumer 86.

The chamber 84 is sealed from the atmosphere by a diaphragm 88 which is suitably clamped to the pilot valve assembly by any suitable means such as a frame 84 and screws 85. A rocker 81 is tiltably secured to the frame 84 at 88. The rocker carries adjustable screws 88 and I88 whose stems extend inwardly toward the pilot valve assembly and engage the diaphragm 83 through openings in the frame 84 for actuating the ball valves 88 and 88. The rocker 81 and actuating screws 88 and I88 are so arranged that when the rocker assumes the mid position, both of the valves 88 and 88 are closed so that the pressure within the pressure chamber 38 remains at a constant value. When the rocker 81 is rotated slightly in a clockwise direction from mid position to the position shown in the drawing, actuating screw 88 forces the ball valve 88 away from its seat, at which time gas can pass from the inlet chamber 11 to chamber 84. When the rocker 81 is rotated in a counter-clockwise position, it per- I mitsthe biasing spring .80 to move ball valve 88 against the seat. At the same time, ball valve 89 is forced away from its seat to establish communication between chambers84 and 18.

The rocker 91 is adapted to be actuated automatically by means of This electromagnet may be of any suitable type normal manner to maintain a constant pressure an electromagnet I04.

butIis shown schematically as comprising an L- I shaped magnetic frame element I05. Secured to one leg of the L-shaped core member is a core post I06 around which a. winding I01 is located. Pivotally secured to the lower end '01 the other .eg 01' the inverted L-shaped element I is an in the chamber between the pressure regulating andshutofl valves Let it be assumed now that there is drop in temperature of the medium to which bimetallic element H8 responds. Under these conditions. contact arm II1 will be moved into engagement with contact II8 so that an energizing circuit will be established to the electromagnet winding I01 as follows: from the upper end of secondary I22 through conductor I25, bimetallic ,element II Ii, contact arm I I1, contact II8, conarmature member I08 which is designed to coop- .arat'e with the core memberfI05. Upon energization of the winding I01, the armature member I 08 is rotated in clockwise direction into engagement post I08. Aslsconimon the end of'the post I08 is provided with J a shading ring II2 to shade a portion 'of the with the end ofv the core 7 with A. C. operated devices, I08 engaged by the armature flux and hence decrease chattering or the relay.

The right-hand end ofarmature I08-isprovided with an upstanding arm I09 adaptedtoextend into a slot H0 or an ear III carriedby the rocker 91. Upon energizationof winding 'I01 torotate armature I08 in a clockwise direction, the resultant clockwise movement of arm I09i causes counterclockwise movement of rocker 91'to in.

turn cause closure of valve88 and tpemng or valve 89, all as previously described..

ductor I26, winding I01, and conductor I28 back to the other terminal of secondary I22. As a result of the establishmentof this circuit, winding I01 is energized to cause armature I08 to rotate in a clockwise direction. As previously explained,

such clockwise rotation of armature I08causes 1 counter-clockwise rotation of rocker 91 to cause closure of valve 88 and movement of valve 89 away from its seat. The closure of ball valve 88 prevents gas from flowing from inlet pipe 12 to the pressure chamber 39. Themovement of ball valve 89 away from its seat permits gas flow from A room thermostat H5 is ,empI yed tocon trol the energization of winding I01 and'hence the operation of pilot valve 18. This thermostat is of conventional form and is shown as comprising a bimetallic element II6 towhich issecured a contact arm H1. The contact arm is designed to cooperate with a fixed contact II8. As shown by the legend adjacent the contact arm II1, the bimetallic element H6 is so arranged that upon a dropintemperature, the contact arm I I1 is moved towards the right into engagepressure chamber 39 to the bleed burner 86 through pipe 83, opening 80, chamber 84, chamber 18, opening 8|, and pipe 85 to bleed burner 86. Because of the establishment of this connection between chamber 39 and bleed burner 86, thepressure within the chamber 39 approaches atmospheric pressure. As previously explained, the pressure immediately above the pressure regvulating valve 29 is normally at the desired operating pressure.

The result is that as soon as the pressure above diaphragm 39 is allowed to bleed off, the pressure beneath the central portion of diaphragm 31 is effective to move valve rings 40 and 4| away from the valve seat 26. As soon as these valve rings start to move away from the valve seat, gas is allowed to flow to the outlet chamber and increase the pressure therein. The

ment with contact II8. Upon a rise in temperature on the other hand, the contact arm H1 is moved to the left away from contact II8.

A step-down transformer I20'is employed for supplying power to the control system. This transformer comprises a line voltage primary I2I and a low voltage secondary I22. The line voltage primary I2I is connected to. any suitable source of power (not shown). 0

Operation The various elements are shown in the position which they assume when there is no demand for burner operation. Under these conditions, the pilot burner 13 is ignited as it always valve is on the downstream side of the chamber to which chamber 42 is connected. Any tendency of the pressure in this chamber to decrease causes the pressure regulating valve 29 to move increased pressure on the underside of diaphragm 31 causes the main valve to move quickly to full open position.

As soon as the main valve is opened, the pressure within the chamber between the pressure regulating valve 29 and the main valve tends to drop to a value more nearly that of the outlet pressure. As a result, the pressure communicated through openings 55 and 51 to chamber 42 likewise tends to drop so that the biasing means comprising spring 60 and lever BI is able to move the stem 30 downwardly to move pressure regulating valve 29 to a more nearly open position and hence to restore the pressure to the desired value. Any further tendency for the outlet pressure to decrease will cause a reduction of the pressure within chamber 42 to cause valve 29 to move even further towards 'full open position. This, in turn, will permit more gasto flow through the two valves in series and hence to restore the outlet pressure to the desired value. Thus, the device will continue to function as a pressure regulator in the normal manner.

The baffle 3|, being located between the pressure regulating valve and the inlet 56 to passage 55, serves to prevent the pressure transmitted towards open position to in turn increase the pressure. If the pressure in the chamber increases. the opposite action will take place. Thus the pressure regulating valve functions in the through passage 55 from being aifected by any turbulent or Venturi efiects that might be pres ent in the space between the pressure regulating and shut-01f valves, Because of the bafiie 3|, opening 56 is in a pocket which is subjectedonly to the static pressure between the valves.

It is to be ,noted when the shut-off valve first opens, the pressure regulator valve 29 is in closed position. The effect of this is that when the shut-off valve initially opens, the fiow of gas will be relatively small until the pressure regulating valve has moved to open position also. This is highly desirable where a burner is located in a relatively small combustion chamber. In such a case, if the gas is initially admitted at too great a rate, the pilot burner is incapable of complete: ly igniting the gas before much of the combustion chamber has been filled with gas. The result .is that the lighting of the gas is accompanied by a concussion which may often be of considerable magnitude. By having the pressure regulator valve respond to the pressure on the upstream side of the shut-off valve rather than the downstream side of the shut-off valve, as is usually the case with combined pressure regulator and cut-oil? assemblies, this advantage of having the pressure regulating valve initially closed is obtained.

It is to be noted that the pilot burner is supplied with gas from the chamber between the pressure regulating and shut-off valves, within which the pressure is maintained constant. Hence the pilot burner is supplied at all times with gas at a substantially constant pressure.

The valve will continue to operate in the manner described until the temperature to which bimetallic element H6 is subjected rises sufficiently high to cause separation of contact arm Ill from contact H8. When this happens, winding I01 is deenergized so that armature I08 drops away from the core. If desired, some biasing means may be associated with the armature I08 to facilitate this action. In any event, the armature Hill, the arm I09, and the rocker 91 move to the position shown in the drawing. The connection between the chamber 39 and bleed burner 85 is thus interrupted and the connection between the supply pipe and chamber 3! is reestablished. As a result, pressure chamber 39 is again subjected to the pressure of the supply pipe so that the shut-oil" valve assumes the position shown in the drawing. This causes the connection between the outlet chamber and the space between the shut-off valve and the pressure regulating valve disk 29 to be interrupted so that this space tends to assume a pressure substantially the same as the inlet chamber pressure.

It will be seen that I have provided an extremely compact combined pressure regulating and shut-off valve in which the pressure regulating valve is disposed on the upstream side of the shut-off valve. By disposing the parts in the manner described and hereinafter claimed, it is possible to have the diaphragm of the main pressure chamber 39 act both as a valve of the pressure motor and also as a main diaphragm itself, and at the same time provide for the pressure regulating valve being on the upstream side of the shut-off valve. By utilizing the spring mechanism consisting of spring 60 and lever 6|, it is possible to make the top member relatively shallow and still have a relatively uniform bias exerted upon the stem 30 throughout its entire range of movement.

While I have shown a specific embodiment of my invention, it is to be understood that this is for purposes of illustration only and the scope of the invention is limited only by the appended claims.

I claim as my invention:

1. A combination pressure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, 9. pressure regulating valve disposed in said valve housing, a shutoff valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-off valve member, a first pressure chamber having said first diaphragm as a movable wall thereof, a second diaphragm secured to said pressure regulating valve, a second pressure chamber having said second diaphragm as a, movable wall thereof, means for varying the pressure within said first pressure chamber to cause said shut-off valve member to move between open and closed positions, and a fluid connection between said second chamber and that portion of the valve housing between said pressure regulating and shut-ofl valves.

2. A combination pressure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, a pressure regulating valve disposed in said valve housing, a shut-off valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-ofl valve member concentrically therewith, a first pressure chamber having said first diaphragm as a movable wall thereof, a second diaphragm concentrically disposed with respect to said first diaphragm and secured to said pressure regulating valve, a second pressure chamber having said second diaphragm as a movable wall thereof, means for varying the pressure within said first pressure chamber to cause said shut-off valve member to move between open and closed positions, and a fluid connection between said second chamber and that portion of the valve housing between said pressure regulating and shut-off valves.

3. A combination pressure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, a pressure regulating valve disposed in said valve housing, a shut-off valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-off valve member, a first pressure chamber having said first diaphragm as a movable wall thereof, a second diaphragm, a valve stem projecting from said pressure regulating valve through said first diaphragm and secured to said second diaphragm, a second pressure chamber having said second diaphragm as a movable wall thereof, means for varying the pressure within said first pressure chamber to cause said shut-off valve member to move between open and closed positions, and a passage through said valve stem extending between said second chamber and that portion of the valve housing between said pressure regulating and shut-off valves.

4. A combination pressure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, a pressure regulating valve disposed in said valve housing, a shut-off valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-off valve member concentrically therewith, a first pressure chamber having said first diaphragm as a movable wall thereof, a second diaphragm concentrically disposed with respect to said first diaphragm, a valve stem projecting from said pressure regulating valve through the center of said first diaphragm and secured to said second diaphragm, a second pressure chamber having said second diaphragm as a movable wall thereof,

means for varying the pressure within said first off valve assembly comprising a valve housing having an inlet andan outlet, a pressure regulating valve disposed in said valve housing, a shut-01f valve'disposedin said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-oil valve member, a first pressure chamber having said first diaphragm as a movable wall thereof, a second diaphragm secured to said pressure regulating valve, a second pressure chamber having said second diaphragm as a movable wall thereof, means including a three-way pilot valve operative in one position to admit inlet pressure to said first pressure chamber to cause said shut-ofl valve member to move to closed position and in another position to permit the fluid within said first pressure chamber to escape to cause said shut-01f valve to move to open position, and a fluid connection between said second chamber and that portion of the valve housing between said ressure regulating and shut-off valves.

6. A combination pi essure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, a pressure regulating valve disposed in said valve housing, a shut-off valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-ofi valve member, a first diaphragm secured to said shut-oil valve member, a first pressure chamber having said flrstdiaphragm as a movable wall thereof, a second diaphragm secured to said pressure regulating valve, 8. second pressure chamber having said second diaphragm as a movable wall thereof, means for varying the pressure within said first pressure chamber to cause said shut-oif valve member to move between open and closed positions, a fluid connection between said second chamber and that portion of the valve housing between said pressure regulating and shut-ofl valves, and a baflle disposed in said last mentioned portion of the valve housing adjacent one end of said passage.

7. A pressure regulating valve comprising a valve housing having an inlet and an outlet, a pressure regulating valve disposed in said valve housing, a valve stem secured to said valve, means biasing said valve to valve open position, 9. diaphragm secured to said valve stem, a pressure chamber including said diaphragm as a movable wall, said valve steim being provided with a passage extending from a portion of said housing on the outlet side of said pressure regulating valve into said pressure chamber, and a baflle disk carried by said valve stem parallel to said valve adjacent the inlet to said passage and between notaifec'ted said valve and inlet-to said passage in such a position that the pressure within said passage by the rate of flow of gas through the .valve. p v v 8i Ina dia'ghra'gmvalve, a housing assembly comprising relatively shallow valve casing and cover sections,=-said'ivalve casing section having an inlet and-Len outlet, a valve member disposed in said valve casing Section, a diaphragm secured to said housing assembly and to saidvalve member to position said valve member, a leaf spring secured inside of said cover section and extending substantially entirely across said cover section,

. a lever pivotally secured inside of said cover section and having-a portion adjacent its pivot point engaging said leaf spring, and means operatively connecting th free end of said lever and said valve member so that said valve member is biased in one direction by said leaf spring. a

9. In a diaphragm valve, a housing assembly comprising relatively shallow valve casing, intermediate, and housing sections, said valve casing section having an inlet and an outlet. a valve member disposed in said valve casing section, a valve stem secured to said valve member and extending through saidintermediate section into said-top section, a diaphragm secured between said top section and said intermediate section and connected at its center to said valve stem, means forming a pressure chamber includingsaid diaphragm as a movable wall, means for varying the pressure in said chamber, a leaf spring secured inside-of said cover section and extending substantially entirely across said cover section,

and a lever pivotally secured inside of said cover sectionand having a portion adjacent its pivot point engaging said leaf spring, the free end of said lever engaging said valve stem so that said valve and valve stem are biased in one direction by said leaf spring.

10. A combination pressure regulator and shutoff valve assembly comprising a valve housing having an inlet and an outlet, 9. pressure regulating valve disposed in said valve housing, a shut-off valve disposed in said housing on the outlet side of said pressure regulating valve and comprising a shut-off valve member, a first diaphragm secured to said shut-of! valve member, a first pressure chamber having said diaphragm as a movable wall thereof, a second diaphragm secured to said pressure regulating valve, a second pressure chamber having said second diaphragm as a movable wall thereof, means for varying the pressure within said first pressure chamber to cause said shut-off valve member to move between open and closed positions, a fluid connection between said second chamber and that portion of the valve housing between said pressure regulating and shut-off valves, said housing being provided with a passage extending from said portion of the housing between said pressure regulator and shut-off valves to the exterior of the casing, and connecting means associated with the outer end of said passage for connecting said passage to a pilot burner.

VILYNN 0. BEAM DISCLAIMER 2,333,913.V'il%m 0. Beam, Minneapolis, Minn. VALVE MECHANISM. Patent dated ovember 9, 1943. Disclaimer filed July 17, 1944, by the assignee,

Minneapolis-Honeywell Regulator Company. Hereby enters this disclaimer to claims, 1, 2, and 5 of said specification.

[Qfl'icial Gazette August 8, 1944.] 

